Asecurity administrator needs to configure remote access to a file share so it can only be accessed between the hours of 9: 00am and 5: 00 pm. files in the share can only be accessed by members of the same department as the data owner. users should only be able to create files with approved extensions, which may differ by department. which of the following access controls would be the most appropriate for this situation? rbacmacabacdac

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.